Mincon MR120-LA RC Hammer (4 1/2″ Metzke)

The MR range of RC hammers is designed to perform at the top end of the performance scale compared to other tools on the market. With extensive testing over an 18 months period the MR range of tools offers some very significant benefits over it’s predecessor, the MX range of RC hammers.
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Performance improvements show up to 20% increase in production in both grade control and exploration applications vs. the Mincon MX range. As with all Mincon hammers the tools performed extremely well in deep hole drilling in dry applications and where there is a lot of water in the bore hole. With a variable length available on the chuck sleeve the hammer can be easily set up for either dry or wet hole drilling. Set to become the standard by which RC hammers will be measured, the Mincon MR range of tools get the job done.

Key Features and Benefits

  • Patented mounting system for fixed internal components.
  • An extremely sturdy shank with a short length allows for greater transfer of energy between the piston and bit.
  • Variable chuck sleeve lengths for varying drilling conditions.
  • Single piece sample tube assembly.
  • Specially heat treated sample tubes offer superior wear resistance vs. our competitors.
  • Variable sample tube bore sizes allows the contractor greater flexibility in setting up his tool.
  • Hardened wear sleeve for optimum wear resistance even in the most abrasive conditions.
  • Multi-start threads on backhead and chuck ensure easy coupling/uncoupling of hammer.
  • Metal sprayed chuck sleeve and wear sleeve options for greater wear resistance on outside circulation.
  • All critical internal components are heat treated under strict control to maximize tool longevity.
  • Ease of service with no special assembly or disassembly tools required.

For more information:

+40 314 253 800
info@romned.ro

Ron van Dam
CEO

Specifications Metric Imperial
Hammer Outside Diameter 120mm 4.75″
Hammer Length (Less Drill Bit) 1165mm 45.9″
Backhead Spanner Flat Size 94mm 4″
Drill Bit Shank Type MR120
Backhead Thread 4 1/2″ Metzke
Drill Bit Size Range 127mm – 143mm 5″ – 5.625″
Hammer Weight (Less Bit) 70 Kgs 154 Lbs
Maximum Drill Bit Weight 14.5 Kgs 32 Lbs
Piston Weight 16 Kgs 35.3 Lbs
Make up Torque 4826-6440 NM 3560-4750 FT Lbs
Backhead Stand Off 0.75mm 0.030″
Recommended Minimum Air Package 25.5m3/min @ 24.1Bar 900cfm @ 350psi
Item Part No Description
MR120AL04 MR120 Hammer 4 1/2″ Metzke – Low Air
1 1300-0780 Internal Circlip
2 MX5053AT31 Adaptor Tube 4 ½ Metzke
3 BS-224 O Ring x 2
4 BS-040 O Ring
5 MX5053SC01 Air Screen
6 MR120BH31 Back Head 4 ½” Metzke
7 BS-241 O Ring
8 8406-175 Check Valve Seal – Nitrile U
9 MR120CV01 Check Valve Plunger
10 MR120SP01 Check Valve Spring
11 MR120SS01 Spacer
12 MX4550LR01 Lock Ring
13 MR120ST01 Sample Tube – Large Bore
MR120ST03 Sample Tube – Small bore
14 BS 228 O Ring
15 MR120DR02 Sample Tube Mount
16 BS 234 O Ring
17 BS 040 O Ring
18 MX5053SR01 Seating Ring
19 MR120IC01 Inner Cylinder
20 MR120PN01 Piston
21 MR120WS01 Wear Sleeve
22 MX5053PR01 Piston Retaining Ring
23 MR120BB01 Aligner Bearing Bush
24 N7-92×4 O Ring x 2
25 BS 237 O Ring
26 MR120BR01 Bit Ring
27 BS 152 O Ring
28 MR120CK01 Chuck
29 MR120CSxxxLMR120CSxxxL Chuck Sleeve
MR120OKIT O Ring Kit
MR120MK01 Make up kit

 Air Pressures are given for compressors operating at seal level at 20° C (68º F). Corrections to actual compressor volume should be made to account for temperature, altitude and relative humidity.

DTH hammers must receive a constant supply of proper rock drill oil to protect the internal components and to provide a good air seal between the hammer’s running surfaces for efficient drilling. Mincon recommends the use of Mincon Envirosafe® Rock Drill Oil (RDO) to maintain optimal performance and extend the life of the internal components. The correct consumption of oil is dependent upon the air volume and conditions. Please refer to the lubrication graph below for recommendations. When drilling in wet conditions the normal amount should be doubled. There should be visual evidence of oil around the drill bit shank and within the tube joints when changing tubes.

If using petroleum based rock drill oils, the recommended grade of oil is dependent on the ambient temperature and the operating pressure. As a rule of thumb, ISO320 grade rock drill oil should be used whenever possible as the hammer is a high frequency tool, however, where the pump cannot pump the oil in colder conditions, a lower grade of oil can be used as per the graph below.

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Diameter Face Type Part Number Description No. x Button Dia (inch) Sample holes Weight Approx.
mm inch Outer Face Centre Kgs. Lbs.
127 5 Drop Centre 5120127D1 MR120 5″ DC BIT 8 * 5/8 4 * 9/16 3 * 1/2 2 15 33.1
127 5 Hard Formation 5120127H1 MR120 5″ HF BIT 8 * 5/8 6 * 9/16 3 * 1/2 2 15 33.1
130 5 1/8 Concave 5120130C1 MR120 5 1/8 CC BIT 8 * 5/8 4 * 9/16 4 * 1/2 2 15 33.1
130 5 1/8 Drop Centre 5120130D2 MR120 5 1/8 DEEP DC BIT 8 * 5/8 4 * 9/16 3 * 1/2 2 15 33.1
130 5 1/8 Hard Formation 5120130H1 MR120 5 1/8 HF BIT 8 * 5/8 6 * 9/16 3 * 1/2 2 15 33.1
133 5 1/4 Concave 5120133C1 MR120 5 1/4 CC BIT 8 * 5/8 4 * 5/8 4 * 1/2 2 15 33.1
133 5 1/4 Drop Centre 5120133D2 MR120 5 1/4 DEEP DC BIT 8 * 5/8 4 * 9/16 3 * 1/2 2 15 33.1
133 5 1/4 Hard Formation 5120133H1 MR120 5 1/4 HF BIT 8 * 5/8 6 * 9/16 4 * 1/2 2 15 33.1
137 5 3/8 Concave 5120137C1 MR120 5 3/8 CC BIT 8 * 5/8 4 * 5/8 4 * 1/2 2 15 33.1
137 5 3/8 Drop Centre 5120137D2 MR120 5 3/8 DEEP DC BIT 8 * 5/8 4 * 5/8 3 * 1/2 2 15 33.1
137 5 3/8 Hard Formation 5120137H1 MR120 5 3/8 HF BIT 8 * 5/8 6 * 5/8 3 * 1/2 2 15 33.1
140 5 1/2 Concave 5120140C1 MR120 5 1/2 CC BIT 8 * 5/8 4 * 5/8 4 * 1/2 2 15 33.1
140 5 1/2 Drop Centre 5120140D2 MR120 5 1/2 DEEP DC BIT 8 * 5/8 4 * 5/8 3 * 1/2 2 15 33.1
140 5 1/2 Hard Formation 5120140H1 MR120 5 1/2 HF BIT 8 * 5/8 6 * 5/8 4 * 1/2 2 15 33.1
143 5 5/8 Drop Centre 5120143D2 MR120 5 5/8 DEEP DC BIT 8 * 5/8 4 * 5/8 3 * 1/2 2 15 33.1
143 5 5/8 Hard Formation 5120143H1 MR120 5 5/8 HF BIT 8 * 5/8 6 * 5/8 4 * 1/2 2 15 33.1
152 6 Drop Centre 5120152C1 MR120 6″ COLLARING BIT 8 * 5/8 6 * 9/16 4 * 1/2 2 16 35.3
165 6 1/2 Drop Centre 5120165C1 MR120 6 1/2 COLLARING BIT 8 * 5/8 8 * 9/16 4 * 9/16 2 18 39.7
190 7 1/2 Drop Centre 5120190C1 MR120 7 1/2 COLLARING BIT 8 * 5/8 12 * 5/8 4 * 6/16 2 21 46.3